Air-compressor.



PATENTED FEB. 19, 1907.

J. O. BANNING. AIR COMPRESSOR.

APPLIGATION FILED DEO.18,1905.

ammtm Josephflfianning, 45 Gil/W I9 wimm his above the' valve 2.

3,0 :of the cap or nut 3 and the up er side of the citizen of the United States, residing Zanesville, 1n the county of Muskingum and in the u per end thereof.

on its scat corrcsponilingly varied.

JOSEPH o. BANNING, OF

PATENT OFFICE.

ZANESVILLE, OHIO.

mwtsommssson.

Specification of Letters Patent;

Patented Feb. 19, 1907.

llpplicatiou filed December 18,1905. Serial No. 292.329.

To all whom it may concern.-

Be it known that I, JosEPn O. BANNING, a at State of Ohio, have invented certain new and uselul Improvements in Air-Compressors; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of this invention is to provide an im roved valve for air-compressors, said valve eing of the compound'type.

The invention consists in the construction hereinafter described and claimed.

In the accompanying drawing, showing an embodiment of the invention, the View illustrates in elevation a double-acting cornpressor in which the compression-chamber, the valves, and the companion piston are depicted in vertical sectional view.

In said view, 1 designates the air-corn:

pressing chamber. 2 is the larger valve, which is equal in diameter to the diameter of the chamber and fits in an a propriate seat 3 c esignates a cap or nut t ireaded into the head of the cylinder Between the lower end valve 2 is secured a strong he ical spring 4. The upper side of the nut and the upper side ol -the valve can be grooved to afford seats for the end coils of the spring 4. By adjusting the nut 3 the rcssure of the spring can be' made greater or css, and therefore the pressure of the valve on the seat correspondingly varied. a

The valve 2 is made with a central port and seat, upon which latter is seated a smaller valve 5, havingastem 5. 'Ihrcaded through the center oi the nut or cap 3 is another smaller nut 6, having its lower and bored axially to form a cavity into which the stem of the smaller valve projects and by which it is guided. .Yithin the bore of the smaller nut b and above the end of the stem 5 is a coil-spring 7, that presses down on the stem, and thercl'orc holds the smaller vulvc i By adprstin its seat in the larger valve 2. ing the smaller nut is the pressure ol the spring 7 can he made grenurr or less, and

therefore the pressure of the smaller valve 5 the nuts 3 and (3 are adapted to be turned iiol li t by an appropriate tool. For instance, the larger one can be turned with a wrench and the smaller one with a screw-driver.

It will be observed that although the turning of the larger nut without readjustment yet the pressure of the two valves on their l respective seats is nevertheless capable of independent regulation, and that, too, without removing either of the nuts from the head of the machine. The advantage of this capacity for independent regulation is that the larger valve may be set for the maximum of compression desired, which compression varies according to the purposes for which the compressed fluid is to be used. and ac cording to the strength of the vessel to con tain such compressed fluid. If the pressure of the larger valve on its seat is varied, the pressure of the small valve on its seat should "be-suitably varied to permit it to pro erly respond to the pressure generated in t 1e comof a iluid-comprcssing chamber, a piston of which is provided with a port and seat to receive the other, iudc cndcnt springs to press on said valves, and two threaded nuts one within the other to press, one on one of the springs, and the other on the ol her of the springs, whereby the pressure of said valves on their seats may be independently regulated.

2. .[n a lluid-comprcssor, the combination of a lluiil-compressing chamber, a piston therein, and two valves one ol' which is pro- |vided with a port and seat to receive the other, indrpcmlrnt springs to press on said for pressing on said springs, said nuts lrcing l indcmndpnlly and r-xlrruully adjustable to l regulate the pressure ol lhc springs.

' 3. in a lluid-rou'prrssor, the combination E of a fluid-coirpressing clurmhcr, a piston therein, a valve 2 i'or said chamber provided i with a port having a valve-scat, a second of the smaller nut a'l'iects both the springs,

1. In a fluid-compressor, the combination therein, and two valves l'o'r said chamber onevalves, and two nuts one within the other 5); MIL-7M8 smaller valve 5 on said seat, an adjustable for adjustment at the exterinl'xof the cham- 10- her.

threaded cap or nut 3 to close the chamber In tes timony" whereof 1 affix my slgnature beyond said valves, asingle coiled spring 4 l e neirclilng the valve 5 and located lzletween' l in presence of tWo Witnesses.

t .e szii cap or nut and the Valve 2 an press- T ing on the latter, an adjustable nut 6 JOSEPH BANNIR threaded centrally into the cap or nut 3, and a spring 7 located between said nut 6 and the valve 5, said Cap 3 and nut 6 being operative I Witnesses: v

ULYSSES R. PETERS, GEORGE M. FINCKEL. 

